138 FUMIGATION METHODS 
in fruit, ferns palms, and a large variety of general 
stove plants. Not only were the mealy bugs, scales, 
and aphides destroyed, but a large per cent. of sow 
bugs were found dead on the walks and under the moss 
which covered the floor of the solid bed in the stove- 
room. Hven the earthworms on the surface of the soil 
under the moss were dead. 
Another house containing 22,729 cubic feet of space 
was fumigated, using one ounce potassium cyanide to 
every 285 cubic feet. It contained carnations, smilax, 
violets, coleus, chrysanthemums, small lettuce, cut- 
tings, and small plants of bedded stock. It was in- 
fested with the common mealy bug, Dactylopius de- 
structor, green fly, and the white-tailed mealy bug, 
Orthezia insignis. It was fumigated for thirty min- 
utes upon a cloudy morning, yet in daylight. The in- 
sects were mostly killed, but some of the plants were 
badly injured. This was especially true in case of the 
smilax, the upper leaves of carnations and lettuce. 
Much of the latter, which was very small and in full 
light, was killed, while some that was shaded showed 
much less injury. The smilax and carnations recov- 
ered in time, but received a severe check. Smilax and 
more delicate plants have been subjected to double 
this strength of gas by the writer, in darkness, without 
injury. 
About the middle of January a camellia-room was 
fumigated with one ounce potassium cyanide to every 
3,000 cubic feet. The room contained 6,196 cubic feet, 
and 2.06 ounces cyanide were used. It was fumigated 
at night about six o’clock, and remained closed until 
morning. 
